Combination lock

A cylinder type combination lock comprising:

• a first body having a cylindrical core portion formed with a key bore,
• a plurality of inner rings, each of said inner rings having a slot in its inner circumference and at least one protrusion on its outer circumference,
• first mounting means for mounting said inner rings on said cylindrical core portion to provide for rotation of said inner rings on said cylinder core portion, said inner rings being mounted rotatably to a position where the slots thereof are in groove alignment with said key bore to form a key groove,
• a second body having a key-like projection provided with key teeth of the same number as said inner rings, said key-like projection being adapted to be inserted into said key groove and to be locked therein when at least one of said inner rings is turned to be out of said groove alignment,
• a plurality of dial rings of the same number as said inner rings,
• second mounting means mounting said dial rings on said inner rings, said second mounting means comprising at least one notch on said dial ring for accommodating said protrusion on said inner ring such that said dial ring may be mounted on said inner ring at a desired relative angular position, one of said dial rings constituting an outermost dial ring, one of said inner rings constituting an outermost inner ring, and
• third mounting means mounting said outermost dial ring on said outermost inner ring, said third mounting means comprising a wire spring having a bent portion and two leg portions parallel to one another, said wire spring being captively retained on said outermost dial ring, said wire spring being manually positioned in a groove in said outermost inner ring in a mounting disposition to biasingly mount said outermost dial ring on said outermost inner ring, said wire spring being manually manipulated to a release disposition to release said outermost dial ring from said outermost inner ring, whereby said dial rings are thereby removable from said inner rings to permit changing the rotational position of each dial ring relative to its respective inner ring to thereby change the combination of said lock without requiring any tools.

A cylinder type combination lock comprising:

• a first body having a head portion and a cylindrical core portion formed with a key bore,
• a plurality of inner rings, each of said inner rings having a slot in its inner circumference and at least one protrusion on its outer circumference,
• first mounting means for mounting said inner rings on said cylindrical core portion to provide for rotation of said inner rings on said cylinder core portion, said inner rings being mounted rotatably to a position where the slots thereof are in groove alignment with said key bore to form a key groove,
• a second body having a head portion and a key-like projection provided with key teeth of the same number as said inner rings, said key-like projection being adapted to be inserted into said key groove and to be locked therein when at least one of said inner rings is turned to be out of said groove alignment,
• dial rings of the same number as said inner rings, each of said dial rings having a plurality of indicia on its outer circumference,
• second mounting means mounting said dial rings on said inner rings, said second mounting means comprising at least one notch on said dial ring for accommodating said protrusion on said inner ring such that said dial ring may be mounted on said inner ring at a desired relative angular position, one of said dial rings constituting an outermost dial ring, one of said inner rings constituting an outermost inner ring and,
• third mounting means mounting said outermost dial ring on said outermost inner ring, said third mounting means comprising a biasing element which is manually positioned in a mounting disposition to biasingly mount said outermost dial ring on said outermost inner ring and which is manually positioned to a release disposition to release said outermost dial ring from said outermost inner ring, whereby said dial rings are thereby removable from said inner rings to permit changing the rotational position of each dial ring relative to its respective inner ring to thereby change the combination of said lock without requiring any tools, said biasing element being a wire spring having a bent portion and two leg portions, said two leg portions being substantially parallel to one another, said outermost inner ring having a groove for receiving said leg portions, said bent portion of said wire spring being manually movable to thereby spread said leg portions so that the latter disengages from said groove in said outermost inner ring.